Jacob fought in the Vietnam, in short the war (1954 – 1975) was between theAmerican and French Colonial Government in South Vietnam against the communist Vietminh, here is a link to further information on the war war http://www.history.com/topics/vietnam-war/vietnam-war-history
Many accusations have been made against the US Government about experimental drug testing American soldiers who participated in the war which allegedly left them suffering with long term neurological effects. At the end of the movie it explicitly mentions the BZ drug and that the Pentagon denies the claims of soldiers;
A chart claiming duration the BZ drug will effect a person per small amount of the drug. ‘Erowid’s effects information is a summary of data gathered from users, research, and other resources’ https://erowid.org/chemicals/bz/bz_effects.shtml
It seems that in 2012 and possibly still today that there are men out there that are still facing health problems of what they believe is from military drug testing of the Vietnam war.
In July 1975, the Washington Post reported that a top civilian drug researcher for the Army said a total of 6,940 servicemen had been involved in chemical and drug experiments. In a May 2004 report, however, the Government Accounting Office (GAO) stated that there were even more victims of the experimental program, a number that may never be completely known.
A few stories of Soldiers who believe the drug testing from Vietnam resulted in their poor health.
Each of the cases is heart wrenching. Take 63-year-old Tim Josephs, who spent two months at Edgewod. Just before his duty there ended, he was hospitalised for days with Parkinson’s-like symptoms that continued to follow him for years. In his mid-50s, he was diagnosed with the disease and forced to retire early.
“I really felt a duty to my country to go and serve,” he said in a recent interview. “You believed in your government. And you just wouldn’t think they would give you something that would harm you intentionally.”
Bruce Price began having troubles with his memory within weeks of leaving Edgewood and has been completely disabled for years. Franklin Rochelle suffers from memory loss, anxiety, vision problems, difficulty breathing and sleep apnea, while William Blazinski has been diagnosed with chronic lymphocytic leukaemia and ulcerative colitis. And the list goes on.
Other Links discussing the BZ Drug